package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器   支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
        HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURI = httpServletRequest.getRequestURI();


        log.info("拦截请求：{}", requestURI);

        String[] urls = new String[]{  //定义不需要处理的请求路径
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };


        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理  直接放行
        if (check) {
            log.info("本次请求{}不需要做处理", requestURI);
            filterChain.doFilter(httpServletRequest, httpServletResponse);
            return;
        }

        //4.判断登录状态  如果登录了  就直接放行  ---PC端
        if (httpServletRequest.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为：{}", httpServletRequest.getSession().getAttribute("employee"));

            Long empId = (Long) httpServletRequest.getSession().getAttribute("employee");

            BaseContext.setThreadLocal(empId);

            filterChain.doFilter(httpServletRequest, httpServletResponse);
            return;
        }

        //5.判断登录状态  如果登录了  就直接放行  ---手机端
        if (httpServletRequest.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", httpServletRequest.getSession().getAttribute("user"));

            Long userId = (Long) httpServletRequest.getSession().getAttribute("user");

            BaseContext.setThreadLocal(userId);

            filterChain.doFilter(httpServletRequest, httpServletResponse);
            return;
        }


        log.info("用户未登录");
        //5.如果没登录  则返回未登录结果 , 通过输出流方式向客户端页面响应数据
        httpServletResponse.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    //路径匹配  检查本次请求是否需要放行
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;

    }
}
